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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * STM32 ALSA SoC Digital Audio Interface (SAI) driver.
- *
- * Copyright (C) 2016, STMicroelectronics - All Rights Reserved
- * Author(s): Olivier Moysan <[email protected]> for STMicroelectronics.
- */
- #include <linux/bitfield.h>
- #include <linux/clk.h>
- #include <linux/delay.h>
- #include <linux/module.h>
- #include <linux/of_platform.h>
- #include <linux/pinctrl/consumer.h>
- #include <linux/reset.h>
- #include <sound/dmaengine_pcm.h>
- #include <sound/core.h>
- #include "stm32_sai.h"
- static const struct stm32_sai_conf stm32_sai_conf_f4 = {
- .version = STM_SAI_STM32F4,
- .fifo_size = 8,
- .has_spdif_pdm = false,
- };
- /*
- * Default settings for stm32 H7 socs and next.
- * These default settings will be overridden if the soc provides
- * support of hardware configuration registers.
- */
- static const struct stm32_sai_conf stm32_sai_conf_h7 = {
- .version = STM_SAI_STM32H7,
- .fifo_size = 8,
- .has_spdif_pdm = true,
- };
- static const struct of_device_id stm32_sai_ids[] = {
- { .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 },
- { .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 },
- {}
- };
- static int stm32_sai_pclk_disable(struct device *dev)
- {
- struct stm32_sai_data *sai = dev_get_drvdata(dev);
- clk_disable_unprepare(sai->pclk);
- return 0;
- }
- static int stm32_sai_pclk_enable(struct device *dev)
- {
- struct stm32_sai_data *sai = dev_get_drvdata(dev);
- int ret;
- ret = clk_prepare_enable(sai->pclk);
- if (ret) {
- dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret);
- return ret;
- }
- return 0;
- }
- static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci)
- {
- int ret;
- /* Enable peripheral clock to allow GCR register access */
- ret = stm32_sai_pclk_enable(&sai->pdev->dev);
- if (ret)
- return ret;
- writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base);
- stm32_sai_pclk_disable(&sai->pdev->dev);
- return 0;
- }
- static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco)
- {
- u32 prev_synco;
- int ret;
- /* Enable peripheral clock to allow GCR register access */
- ret = stm32_sai_pclk_enable(&sai->pdev->dev);
- if (ret)
- return ret;
- dev_dbg(&sai->pdev->dev, "Set %pOFn%s as synchro provider\n",
- sai->pdev->dev.of_node,
- synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
- prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base));
- if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) {
- dev_err(&sai->pdev->dev, "%pOFn%s already set as sync provider\n",
- sai->pdev->dev.of_node,
- prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B");
- stm32_sai_pclk_disable(&sai->pdev->dev);
- return -EINVAL;
- }
- writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base);
- stm32_sai_pclk_disable(&sai->pdev->dev);
- return 0;
- }
- static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,
- struct device_node *np_provider,
- int synco, int synci)
- {
- struct platform_device *pdev = of_find_device_by_node(np_provider);
- struct stm32_sai_data *sai_provider;
- int ret;
- if (!pdev) {
- dev_err(&sai_client->pdev->dev,
- "Device not found for node %pOFn\n", np_provider);
- of_node_put(np_provider);
- return -ENODEV;
- }
- sai_provider = platform_get_drvdata(pdev);
- if (!sai_provider) {
- dev_err(&sai_client->pdev->dev,
- "SAI sync provider data not found\n");
- ret = -EINVAL;
- goto error;
- }
- /* Configure sync client */
- ret = stm32_sai_sync_conf_client(sai_client, synci);
- if (ret < 0)
- goto error;
- /* Configure sync provider */
- ret = stm32_sai_sync_conf_provider(sai_provider, synco);
- error:
- put_device(&pdev->dev);
- of_node_put(np_provider);
- return ret;
- }
- static int stm32_sai_probe(struct platform_device *pdev)
- {
- struct stm32_sai_data *sai;
- struct reset_control *rst;
- const struct of_device_id *of_id;
- u32 val;
- int ret;
- sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
- if (!sai)
- return -ENOMEM;
- sai->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(sai->base))
- return PTR_ERR(sai->base);
- of_id = of_match_device(stm32_sai_ids, &pdev->dev);
- if (of_id)
- memcpy(&sai->conf, (const struct stm32_sai_conf *)of_id->data,
- sizeof(struct stm32_sai_conf));
- else
- return -EINVAL;
- if (!STM_SAI_IS_F4(sai)) {
- sai->pclk = devm_clk_get(&pdev->dev, "pclk");
- if (IS_ERR(sai->pclk))
- return dev_err_probe(&pdev->dev, PTR_ERR(sai->pclk),
- "missing bus clock pclk\n");
- }
- sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");
- if (IS_ERR(sai->clk_x8k))
- return dev_err_probe(&pdev->dev, PTR_ERR(sai->clk_x8k),
- "missing x8k parent clock\n");
- sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");
- if (IS_ERR(sai->clk_x11k))
- return dev_err_probe(&pdev->dev, PTR_ERR(sai->clk_x11k),
- "missing x11k parent clock\n");
- /* init irqs */
- sai->irq = platform_get_irq(pdev, 0);
- if (sai->irq < 0)
- return sai->irq;
- /* reset */
- rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
- if (IS_ERR(rst))
- return dev_err_probe(&pdev->dev, PTR_ERR(rst),
- "Reset controller error\n");
- reset_control_assert(rst);
- udelay(2);
- reset_control_deassert(rst);
- /* Enable peripheral clock to allow register access */
- ret = clk_prepare_enable(sai->pclk);
- if (ret) {
- dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);
- return ret;
- }
- val = FIELD_GET(SAI_IDR_ID_MASK,
- readl_relaxed(sai->base + STM_SAI_IDR));
- if (val == SAI_IPIDR_NUMBER) {
- val = readl_relaxed(sai->base + STM_SAI_HWCFGR);
- sai->conf.fifo_size = FIELD_GET(SAI_HWCFGR_FIFO_SIZE, val);
- sai->conf.has_spdif_pdm = !!FIELD_GET(SAI_HWCFGR_SPDIF_PDM,
- val);
- val = readl_relaxed(sai->base + STM_SAI_VERR);
- sai->conf.version = val;
- dev_dbg(&pdev->dev, "SAI version: %lu.%lu registered\n",
- FIELD_GET(SAI_VERR_MAJ_MASK, val),
- FIELD_GET(SAI_VERR_MIN_MASK, val));
- }
- clk_disable_unprepare(sai->pclk);
- sai->pdev = pdev;
- sai->set_sync = &stm32_sai_set_sync;
- platform_set_drvdata(pdev, sai);
- return devm_of_platform_populate(&pdev->dev);
- }
- #ifdef CONFIG_PM_SLEEP
- /*
- * When pins are shared by two sai sub instances, pins have to be defined
- * in sai parent node. In this case, pins state is not managed by alsa fw.
- * These pins are managed in suspend/resume callbacks.
- */
- static int stm32_sai_suspend(struct device *dev)
- {
- struct stm32_sai_data *sai = dev_get_drvdata(dev);
- int ret;
- ret = stm32_sai_pclk_enable(dev);
- if (ret)
- return ret;
- sai->gcr = readl_relaxed(sai->base);
- stm32_sai_pclk_disable(dev);
- return pinctrl_pm_select_sleep_state(dev);
- }
- static int stm32_sai_resume(struct device *dev)
- {
- struct stm32_sai_data *sai = dev_get_drvdata(dev);
- int ret;
- ret = stm32_sai_pclk_enable(dev);
- if (ret)
- return ret;
- writel_relaxed(sai->gcr, sai->base);
- stm32_sai_pclk_disable(dev);
- return pinctrl_pm_select_default_state(dev);
- }
- #endif /* CONFIG_PM_SLEEP */
- static const struct dev_pm_ops stm32_sai_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(stm32_sai_suspend, stm32_sai_resume)
- };
- MODULE_DEVICE_TABLE(of, stm32_sai_ids);
- static struct platform_driver stm32_sai_driver = {
- .driver = {
- .name = "st,stm32-sai",
- .of_match_table = stm32_sai_ids,
- .pm = &stm32_sai_pm_ops,
- },
- .probe = stm32_sai_probe,
- };
- module_platform_driver(stm32_sai_driver);
- MODULE_DESCRIPTION("STM32 Soc SAI Interface");
- MODULE_AUTHOR("Olivier Moysan <[email protected]>");
- MODULE_ALIAS("platform:st,stm32-sai");
- MODULE_LICENSE("GPL v2");
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